Merge changes from topic "migrate-sc-bt" into sc-v2-dev-plus-aosp

* changes:
  Migrating BT files into packages/modules/Bluetooth
  Merge history of Bluetooth API from frameworks/base

1 files changed, 1505 insertions, 0 deletions

diff --git a/framework/java/android/bluetooth/BluetoothHeadset.java b/framework/java/android/bluetooth/BluetoothHeadset.java
new file mode 100644
index 0000000000..1b141c9afa
--- /dev/null
+++ b/framework/java/android/bluetooth/BluetoothHeadset.java
@@ -0,0 +1,1505 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.bluetooth;
+
+import static android.bluetooth.BluetoothUtils.getSyncTimeout;
+
+import android.annotation.NonNull;
+import android.annotation.Nullable;
+import android.annotation.RequiresPermission;
+import android.annotation.SdkConstant;
+import android.annotation.SdkConstant.SdkConstantType;
+import android.annotation.SuppressLint;
+import android.annotation.SystemApi;
+import android.bluetooth.annotations.RequiresBluetoothConnectPermission;
+import android.bluetooth.annotations.RequiresLegacyBluetoothAdminPermission;
+import android.bluetooth.annotations.RequiresLegacyBluetoothPermission;
+import android.compat.annotation.UnsupportedAppUsage;
+import android.content.AttributionSource;
+import android.content.ComponentName;
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.os.Build;
+import android.os.Handler;
+import android.os.IBinder;
+import android.os.Looper;
+import android.os.Message;
+import android.os.RemoteException;
+import android.util.CloseGuard;
+import android.util.Log;
+
+import com.android.modules.utils.SynchronousResultReceiver;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.TimeoutException;
+
+/**
+ * Public API for controlling the Bluetooth Headset Service. This includes both
+ * Bluetooth Headset and Handsfree (v1.5) profiles.
+ *
+ * <p>BluetoothHeadset is a proxy object for controlling the Bluetooth Headset
+ * Service via IPC.
+ *
+ * <p> Use {@link BluetoothAdapter#getProfileProxy} to get
+ * the BluetoothHeadset proxy object. Use
+ * {@link BluetoothAdapter#closeProfileProxy} to close the service connection.
+ *
+ * <p> Android only supports one connected Bluetooth Headset at a time.
+ * Each method is protected with its appropriate permission.
+ */
+public final class BluetoothHeadset implements BluetoothProfile {
+    private static final String TAG = "BluetoothHeadset";
+    private static final boolean DBG = true;
+    private static final boolean VDBG = false;
+
+    /**
+     * Intent used to broadcast the change in connection state of the Headset
+     * profile.
+     *
+     * <p>This intent will have 3 extras:
+     * <ul>
+     * <li> {@link #EXTRA_STATE} - The current state of the profile. </li>
+     * <li> {@link #EXTRA_PREVIOUS_STATE}- The previous state of the profile. </li>
+     * <li> {@link BluetoothDevice#EXTRA_DEVICE} - The remote device. </li>
+     * </ul>
+     * <p>{@link #EXTRA_STATE} or {@link #EXTRA_PREVIOUS_STATE} can be any of
+     * {@link #STATE_DISCONNECTED}, {@link #STATE_CONNECTING},
+     * {@link #STATE_CONNECTED}, {@link #STATE_DISCONNECTING}.
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
+    public static final String ACTION_CONNECTION_STATE_CHANGED =
+            "android.bluetooth.headset.profile.action.CONNECTION_STATE_CHANGED";
+
+    /**
+     * Intent used to broadcast the change in the Audio Connection state of the
+     * HFP profile.
+     *
+     * <p>This intent will have 3 extras:
+     * <ul>
+     * <li> {@link #EXTRA_STATE} - The current state of the profile. </li>
+     * <li> {@link #EXTRA_PREVIOUS_STATE}- The previous state of the profile. </li>
+     * <li> {@link BluetoothDevice#EXTRA_DEVICE} - The remote device. </li>
+     * </ul>
+     * <p>{@link #EXTRA_STATE} or {@link #EXTRA_PREVIOUS_STATE} can be any of
+     * {@link #STATE_AUDIO_CONNECTED}, {@link #STATE_AUDIO_DISCONNECTED},
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
+    public static final String ACTION_AUDIO_STATE_CHANGED =
+            "android.bluetooth.headset.profile.action.AUDIO_STATE_CHANGED";
+
+    /**
+     * Intent used to broadcast the selection of a connected device as active.
+     *
+     * <p>This intent will have one extra:
+     * <ul>
+     * <li> {@link BluetoothDevice#EXTRA_DEVICE} - The remote device. It can
+     * be null if no device is active. </li>
+     * </ul>
+     *
+     * @hide
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
+    @UnsupportedAppUsage(trackingBug = 171933273)
+    public static final String ACTION_ACTIVE_DEVICE_CHANGED =
+            "android.bluetooth.headset.profile.action.ACTIVE_DEVICE_CHANGED";
+
+    /**
+     * Intent used to broadcast that the headset has posted a
+     * vendor-specific event.
+     *
+     * <p>This intent will have 4 extras and 1 category.
+     * <ul>
+     * <li> {@link BluetoothDevice#EXTRA_DEVICE} - The remote Bluetooth Device
+     * </li>
+     * <li> {@link #EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD} - The vendor
+     * specific command </li>
+     * <li> {@link #EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD_TYPE} - The AT
+     * command type which can be one of  {@link #AT_CMD_TYPE_READ},
+     * {@link #AT_CMD_TYPE_TEST}, or {@link #AT_CMD_TYPE_SET},
+     * {@link #AT_CMD_TYPE_BASIC},{@link #AT_CMD_TYPE_ACTION}. </li>
+     * <li> {@link #EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_ARGS} - Command
+     * arguments. </li>
+     * </ul>
+     *
+     * <p> The category is the Company ID of the vendor defining the
+     * vendor-specific command. {@link BluetoothAssignedNumbers}
+     *
+     * For example, for Plantronics specific events
+     * Category will be {@link #VENDOR_SPECIFIC_HEADSET_EVENT_COMPANY_ID_CATEGORY}.55
+     *
+     * <p> For example, an AT+XEVENT=foo,3 will get translated into
+     * <ul>
+     * <li> EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD = +XEVENT </li>
+     * <li> EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD_TYPE = AT_CMD_TYPE_SET </li>
+     * <li> EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_ARGS = foo, 3 </li>
+     * </ul>
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
+    public static final String ACTION_VENDOR_SPECIFIC_HEADSET_EVENT =
+            "android.bluetooth.headset.action.VENDOR_SPECIFIC_HEADSET_EVENT";
+
+    /**
+     * A String extra field in {@link #ACTION_VENDOR_SPECIFIC_HEADSET_EVENT}
+     * intents that contains the name of the vendor-specific command.
+     */
+    public static final String EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD =
+            "android.bluetooth.headset.extra.VENDOR_SPECIFIC_HEADSET_EVENT_CMD";
+
+    /**
+     * An int extra field in {@link #ACTION_VENDOR_SPECIFIC_HEADSET_EVENT}
+     * intents that contains the AT command type of the vendor-specific command.
+     */
+    public static final String EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD_TYPE =
+            "android.bluetooth.headset.extra.VENDOR_SPECIFIC_HEADSET_EVENT_CMD_TYPE";
+
+    /**
+     * AT command type READ used with
+     * {@link #EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD_TYPE}
+     * For example, AT+VGM?. There are no arguments for this command type.
+     */
+    public static final int AT_CMD_TYPE_READ = 0;
+
+    /**
+     * AT command type TEST used with
+     * {@link #EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD_TYPE}
+     * For example, AT+VGM=?. There are no arguments for this command type.
+     */
+    public static final int AT_CMD_TYPE_TEST = 1;
+
+    /**
+     * AT command type SET used with
+     * {@link #EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD_TYPE}
+     * For example, AT+VGM=<args>.
+     */
+    public static final int AT_CMD_TYPE_SET = 2;
+
+    /**
+     * AT command type BASIC used with
+     * {@link #EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD_TYPE}
+     * For example, ATD. Single character commands and everything following the
+     * character are arguments.
+     */
+    public static final int AT_CMD_TYPE_BASIC = 3;
+
+    /**
+     * AT command type ACTION used with
+     * {@link #EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_CMD_TYPE}
+     * For example, AT+CHUP. There are no arguments for action commands.
+     */
+    public static final int AT_CMD_TYPE_ACTION = 4;
+
+    /**
+     * A Parcelable String array extra field in
+     * {@link #ACTION_VENDOR_SPECIFIC_HEADSET_EVENT} intents that contains
+     * the arguments to the vendor-specific command.
+     */
+    public static final String EXTRA_VENDOR_SPECIFIC_HEADSET_EVENT_ARGS =
+            "android.bluetooth.headset.extra.VENDOR_SPECIFIC_HEADSET_EVENT_ARGS";
+
+    /**
+     * The intent category to be used with {@link #ACTION_VENDOR_SPECIFIC_HEADSET_EVENT}
+     * for the companyId
+     */
+    public static final String VENDOR_SPECIFIC_HEADSET_EVENT_COMPANY_ID_CATEGORY =
+            "android.bluetooth.headset.intent.category.companyid";
+
+    /**
+     * A vendor-specific command for unsolicited result code.
+     */
+    public static final String VENDOR_RESULT_CODE_COMMAND_ANDROID = "+ANDROID";
+
+    /**
+     * A vendor-specific AT command
+     *
+     * @hide
+     */
+    public static final String VENDOR_SPECIFIC_HEADSET_EVENT_XAPL = "+XAPL";
+
+    /**
+     * A vendor-specific AT command
+     *
+     * @hide
+     */
+    public static final String VENDOR_SPECIFIC_HEADSET_EVENT_IPHONEACCEV = "+IPHONEACCEV";
+
+    /**
+     * Battery level indicator associated with
+     * {@link #VENDOR_SPECIFIC_HEADSET_EVENT_IPHONEACCEV}
+     *
+     * @hide
+     */
+    public static final int VENDOR_SPECIFIC_HEADSET_EVENT_IPHONEACCEV_BATTERY_LEVEL = 1;
+
+    /**
+     * A vendor-specific AT command
+     *
+     * @hide
+     */
+    public static final String VENDOR_SPECIFIC_HEADSET_EVENT_XEVENT = "+XEVENT";
+
+    /**
+     * Battery level indicator associated with {@link #VENDOR_SPECIFIC_HEADSET_EVENT_XEVENT}
+     *
+     * @hide
+     */
+    public static final String VENDOR_SPECIFIC_HEADSET_EVENT_XEVENT_BATTERY_LEVEL = "BATTERY";
+
+    /**
+     * Headset state when SCO audio is not connected.
+     * This state can be one of
+     * {@link #EXTRA_STATE} or {@link #EXTRA_PREVIOUS_STATE} of
+     * {@link #ACTION_AUDIO_STATE_CHANGED} intent.
+     */
+    public static final int STATE_AUDIO_DISCONNECTED = 10;
+
+    /**
+     * Headset state when SCO audio is connecting.
+     * This state can be one of
+     * {@link #EXTRA_STATE} or {@link #EXTRA_PREVIOUS_STATE} of
+     * {@link #ACTION_AUDIO_STATE_CHANGED} intent.
+     */
+    public static final int STATE_AUDIO_CONNECTING = 11;
+
+    /**
+     * Headset state when SCO audio is connected.
+     * This state can be one of
+     * {@link #EXTRA_STATE} or {@link #EXTRA_PREVIOUS_STATE} of
+     * {@link #ACTION_AUDIO_STATE_CHANGED} intent.
+     */
+    public static final int STATE_AUDIO_CONNECTED = 12;
+
+    /**
+     * Intent used to broadcast the headset's indicator status
+     *
+     * <p>This intent will have 3 extras:
+     * <ul>
+     * <li> {@link #EXTRA_HF_INDICATORS_IND_ID} - The Assigned number of headset Indicator which
+     * is supported by the headset ( as indicated by AT+BIND command in the SLC
+     * sequence) or whose value is changed (indicated by AT+BIEV command) </li>
+     * <li> {@link #EXTRA_HF_INDICATORS_IND_VALUE} - Updated value of headset indicator. </li>
+     * <li> {@link BluetoothDevice#EXTRA_DEVICE} - Remote device. </li>
+     * </ul>
+     * <p>{@link #EXTRA_HF_INDICATORS_IND_ID} is defined by Bluetooth SIG and each of the indicators
+     * are given an assigned number. Below shows the assigned number of Indicator added so far
+     * - Enhanced Safety - 1, Valid Values: 0 - Disabled, 1 - Enabled
+     * - Battery Level - 2, Valid Values: 0~100 - Remaining level of Battery
+     *
+     * @hide
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
+    public static final String ACTION_HF_INDICATORS_VALUE_CHANGED =
+            "android.bluetooth.headset.action.HF_INDICATORS_VALUE_CHANGED";
+
+    /**
+     * A int extra field in {@link #ACTION_HF_INDICATORS_VALUE_CHANGED}
+     * intents that contains the assigned number of the headset indicator as defined by
+     * Bluetooth SIG that is being sent. Value range is 0-65535 as defined in HFP 1.7
+     *
+     * @hide
+     */
+    public static final String EXTRA_HF_INDICATORS_IND_ID =
+            "android.bluetooth.headset.extra.HF_INDICATORS_IND_ID";
+
+    /**
+     * A int extra field in {@link #ACTION_HF_INDICATORS_VALUE_CHANGED}
+     * intents that contains the value of the Headset indicator that is being sent.
+     *
+     * @hide
+     */
+    public static final String EXTRA_HF_INDICATORS_IND_VALUE =
+            "android.bluetooth.headset.extra.HF_INDICATORS_IND_VALUE";
+
+    private static final int MESSAGE_HEADSET_SERVICE_CONNECTED = 100;
+    private static final int MESSAGE_HEADSET_SERVICE_DISCONNECTED = 101;
+
+    private final CloseGuard mCloseGuard = new CloseGuard();
+
+    private Context mContext;
+    private ServiceListener mServiceListener;
+    private volatile IBluetoothHeadset mService;
+    private final BluetoothAdapter mAdapter;
+    private final AttributionSource mAttributionSource;
+
+    @SuppressLint("AndroidFrameworkBluetoothPermission")
+    private final IBluetoothStateChangeCallback mBluetoothStateChangeCallback =
+            new IBluetoothStateChangeCallback.Stub() {
+                public void onBluetoothStateChange(boolean up) {
+                    if (DBG) Log.d(TAG, "onBluetoothStateChange: up=" + up);
+                    if (!up) {
+                        doUnbind();
+                    } else {
+                        doBind();
+                    }
+                }
+            };
+
+    /**
+     * Create a BluetoothHeadset proxy object.
+     */
+    /* package */ BluetoothHeadset(Context context, ServiceListener l, BluetoothAdapter adapter) {
+        mContext = context;
+        mServiceListener = l;
+        mAdapter = adapter;
+        mAttributionSource = adapter.getAttributionSource();
+
+        // Preserve legacy compatibility where apps were depending on
+        // registerStateChangeCallback() performing a permissions check which
+        // has been relaxed in modern platform versions
+        if (context.getApplicationInfo().targetSdkVersion <= Build.VERSION_CODES.R
+                && context.checkSelfPermission(android.Manifest.permission.BLUETOOTH)
+                        != PackageManager.PERMISSION_GRANTED) {
+            throw new SecurityException("Need BLUETOOTH permission");
+        }
+
+        IBluetoothManager mgr = mAdapter.getBluetoothManager();
+        if (mgr != null) {
+            try {
+                mgr.registerStateChangeCallback(mBluetoothStateChangeCallback);
+            } catch (RemoteException e) {
+                Log.e(TAG, "", e);
+            }
+        }
+
+        doBind();
+        mCloseGuard.open("close");
+    }
+
+    private boolean doBind() {
+        synchronized (mConnection) {
+            if (mService == null) {
+                if (VDBG) Log.d(TAG, "Binding service...");
+                try {
+                    return mAdapter.getBluetoothManager().bindBluetoothProfileService(
+                            BluetoothProfile.HEADSET, mConnection);
+                } catch (RemoteException e) {
+                    Log.e(TAG, "Unable to bind HeadsetService", e);
+                }
+            }
+        }
+        return false;
+    }
+
+    private void doUnbind() {
+        synchronized (mConnection) {
+            if (mService != null) {
+                if (VDBG) Log.d(TAG, "Unbinding service...");
+                try {
+                    mAdapter.getBluetoothManager().unbindBluetoothProfileService(
+                            BluetoothProfile.HEADSET, mConnection);
+                } catch (RemoteException e) {
+                    Log.e(TAG, "Unable to unbind HeadsetService", e);
+                } finally {
+                    mService = null;
+                }
+            }
+        }
+    }
+
+    /**
+     * Close the connection to the backing service.
+     * Other public functions of BluetoothHeadset will return default error
+     * results once close() has been called. Multiple invocations of close()
+     * are ok.
+     */
+    @UnsupportedAppUsage
+    /*package*/ void close() {
+        if (VDBG) log("close()");
+
+        IBluetoothManager mgr = mAdapter.getBluetoothManager();
+        if (mgr != null) {
+            try {
+                mgr.unregisterStateChangeCallback(mBluetoothStateChangeCallback);
+            } catch (RemoteException re) {
+                Log.e(TAG, "", re);
+            }
+        }
+        mServiceListener = null;
+        doUnbind();
+        mCloseGuard.close();
+    }
+
+    /** {@hide} */
+    @Override
+    protected void finalize() throws Throwable {
+        mCloseGuard.warnIfOpen();
+        close();
+    }
+
+    /**
+     * Initiate connection to a profile of the remote bluetooth device.
+     *
+     * <p> Currently, the system supports only 1 connection to the
+     * headset/handsfree profile. The API will automatically disconnect connected
+     * devices before connecting.
+     *
+     * <p> This API returns false in scenarios like the profile on the
+     * device is already connected or Bluetooth is not turned on.
+     * When this API returns true, it is guaranteed that
+     * connection state intent for the profile will be broadcasted with
+     * the state. Users can get the connection state of the profile
+     * from this intent.
+     *
+     * @param device Remote Bluetooth Device
+     * @return false on immediate error, true otherwise
+     * @hide
+     */
+    @SystemApi
+    @RequiresLegacyBluetoothAdminPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(allOf = {
+            android.Manifest.permission.BLUETOOTH_CONNECT,
+            android.Manifest.permission.MODIFY_PHONE_STATE,
+    })
+    public boolean connect(BluetoothDevice device) {
+        if (DBG) log("connect(" + device + ")");
+        final IBluetoothHeadset service = mService;
+        final boolean defaultValue = false;
+        if (service == null) {
+            Log.w(TAG, "Proxy not attached to service");
+            if (DBG) log(Log.getStackTraceString(new Throwable()));
+        } else if (isEnabled() && isValidDevice(device)) {
+            try {
+                final SynchronousResultReceiver<Boolean> recv = new SynchronousResultReceiver();
+                service.connectWithAttribution(device, mAttributionSource, recv);
+                return recv.awaitResultNoInterrupt(getSyncTimeout()).getValue(defaultValue);
+            } catch (RemoteException | TimeoutException e) {
+                Log.e(TAG, e.toString() + "\n" + Log.getStackTraceString(new Throwable()));
+            }
+        }
+        return defaultValue;
+    }
+
+    /**
+     * Initiate disconnection from a profile
+     *
+     * <p> This API will return false in scenarios like the profile on the
+     * Bluetooth device is not in connected state etc. When this API returns,
+     * true, it is guaranteed that the connection state change
+     * intent will be broadcasted with the state. Users can get the
+     * disconnection state of the profile from this intent.
+     *
+     * <p> If the disconnection is initiated by a remote device, the state
+     * will transition from {@link #STATE_CONNECTED} to
+     * {@link #STATE_DISCONNECTED}. If the disconnect is initiated by the
+     * host (local) device the state will transition from
+     * {@link #STATE_CONNECTED} to state {@link #STATE_DISCONNECTING} to
+     * state {@link #STATE_DISCONNECTED}. The transition to
+     * {@link #STATE_DISCONNECTING} can be used to distinguish between the
+     * two scenarios.
+     *
+     * @param device Remote Bluetooth Device
+     * @return false on immediate error, true otherwise
+     * @hide
+     */
+    @SystemApi
+    @RequiresLegacyBluetoothAdminPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public boolean disconnect(BluetoothDevice device) {
+        if (DBG) log("disconnect(" + device + ")");
+        final IBluetoothHeadset service = mService;
+        final boolean defaultValue = false;
+        if (service == null) {
+            Log.w(TAG, "Proxy not attached to service");
+            if (DBG) log(Log.getStackTraceString(new Throwable()));
+        } else if (isEnabled() && isValidDevice(device)) {
+            try {
+                final SynchronousResultReceiver<Boolean> recv = new SynchronousResultReceiver();
+                service.disconnectWithAttribution(device, mAttributionSource, recv);
+                return recv.awaitResultNoInterrupt(getSyncTimeout()).getValue(defaultValue);
+            } catch (RemoteException | TimeoutException e) {
+                Log.e(TAG, e.toString() + "\n" + Log.getStackTraceString(new Throwable()));
+            }
+        }
+        return defaultValue;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public List<BluetoothDevice> getConnectedDevices() {
+        if (VDBG) log("getConnectedDevices()");
+        final IBluetoothHeadset service = mService;
+        final List<BluetoothDevice> defaultValue = new ArrayList<BluetoothDevice>();
+        if (service == null) {
+            Log.w(TAG, "Proxy not attached to service");
+            if (DBG) log(Log.getStackTraceString(new Throwable()));
+        } else if (isEnabled()) {
+            try {
+                final SynchronousResultReceiver<List<BluetoothDevice>> recv =
+                        new SynchronousResultReceiver();
+                service.getConnectedDevicesWithAttribution(mAttributionSource, recv);
+                return Attributable.setAttributionSource(
+                        recv.awaitResultNoInterrupt(getSyncTimeout()).getValue(defaultValue),
+                        mAttributionSource);
+            } catch (RemoteException | TimeoutException e) {
+                Log.e(TAG, e.toString() + "\n" + Log.getStackTraceString(new Throwable()));
+            }
+        }
+        return defaultValue;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public List<BluetoothDevice> getDevicesMatchingConnectionStates(int[] states) {
+        if (VDBG) log("getDevicesMatchingStates()");
+        final IBluetoothHeadset service = mService;
+        final List<BluetoothDevice> defaultValue = new ArrayList<BluetoothDevice>();
+        if (service == null) {
+            Log.w(TAG, "Proxy not attached to service");
+            if (DBG) log(Log.getStackTraceString(new Throwable()));
+        } else if (isEnabled()) {
+            try {
+                final SynchronousResultReceiver<List<BluetoothDevice>> recv =
+                        new SynchronousResultReceiver();
+                service.getDevicesMatchingConnectionStates(states, mAttributionSource, recv);
+                return Attributable.setAttributionSource(
+                        recv.awaitResultNoInterrupt(getSyncTimeout()).getValue(defaultValue),
+                        mAttributionSource);
+            } catch (RemoteException | TimeoutException e) {
+                Log.e(TAG, e.toString() + "\n" + Log.getStackTraceString(new Throwable()));
+            }
+        }
+        return defaultValue;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public int getConnectionState(BluetoothDevice device) {
+        if (VDBG) log("getConnectionState(" + device + ")");
+        final IBluetoothHeadset service = mService;
+        final int defaultValue = BluetoothProfile.STATE_DISCONNECTED;
+        if (service == null) {
+            Log.w(TAG, "Proxy not attached to service");
+            if (DBG) log(Log.getStackTraceString(new Throwable()));
+        } else if (isEnabled() && isValidDevice(device)) {
+            try {
+                final SynchronousResultReceiver<Integer> recv = new SynchronousResultReceiver();
+                service.getConnectionStateWithAttribution(device, mAttributionSource, recv);
+                return recv.awaitResultNoInterrupt(getSyncTimeout()).getValue(defaultValue);
+            } catch (RemoteException | TimeoutException e) {
+                Log.e(TAG, e.toString() + "\n" + Log.getStackTraceString(new Throwable()));
+            }
+        }
+        return defaultValue;
+    }
+
+    /**
+     * Set priority of the profile
+     *
+     * <p> The device should already be paired.
+     * Priority can be one of {@link BluetoothProfile#PRIORITY_ON} or
+     * {@link BluetoothProfile#PRIORITY_OFF}
+     *
+     * @param device Paired bluetooth device
+     * @param priority
+     * @return true if priority is set, false on error
+     * @hide
+     * @deprecated Replaced with {@link #setConnectionPolicy(BluetoothDevice, int)}
+     * @removed
+     */
+    @Deprecated
+    @SystemApi
+    @RequiresLegacyBluetoothAdminPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(allOf = {
+            android.Manifest.permission.BLUETOOTH_CONNECT,
+            android.Manifest.permission.MODIFY_PHONE_STATE,
+    })
+    public boolean setPriority(BluetoothDevice device, int priority) {
+        if (DBG) log("setPriority(" + device + ", " + priority + ")");
+        return setConnectionPolicy(device, BluetoothAdapter.priorityToConnectionPolicy(priority));
+    }
+
+    /**
+     * Set connection policy of the profile
+     *
+     * <p> The device should already be paired.
+     * Connection policy can be one of {@link #CONNECTION_POLICY_ALLOWED},
+     * {@link #CONNECTION_POLICY_FORBIDDEN}, {@link #CONNECTION_POLICY_UNKNOWN}
+     *
+     * @param device Paired bluetooth device
+     * @param connectionPolicy is the connection policy to set to for this profile
+     * @return true if connectionPolicy is set, false on error
+     * @hide
+     */
+    @SystemApi
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(allOf = {
+            android.Manifest.permission.BLUETOOTH_CONNECT,
+            android.Manifest.permission.BLUETOOTH_PRIVILEGED,
+            android.Manifest.permission.MODIFY_PHONE_STATE,
+    })
+    public boolean setConnectionPolicy(@NonNull BluetoothDevice device,
+            @ConnectionPolicy int connectionPolicy) {
+        if (DBG) log("setConnectionPolicy(" + device + ", " + connectionPolicy + ")");
+        final IBluetoothHeadset service = mService;
+        final boolean defaultValue = false;
+        if (service == null) {
+            Log.w(TAG, "Proxy not attached to service");
+            if (DBG) log(Log.getStackTraceString(new Throwable()));
+        } else if (isEnabled() && isValidDevice(device)
+                && (connectionPolicy == BluetoothProfile.CONNECTION_POLICY_FORBIDDEN
+                    || connectionPolicy == BluetoothProfile.CONNECTION_POLICY_ALLOWED)) {
+            try {
+                final SynchronousResultReceiver<Boolean> recv = new SynchronousResultReceiver();
+                service.setConnectionPolicy(device, connectionPolicy, mAttributionSource, recv);
+                return recv.awaitResultNoInterrupt(getSyncTimeout()).getValue(defaultValue);
+            } catch (RemoteException | TimeoutException e) {
+                Log.e(TAG, e.toString() + "\n" + Log.getStackTraceString(new Throwable()));
+            }
+        }
+        return defaultValue;
+    }
+
+    /**
+     * Get the priority of the profile.
+     *
+     * <p> The priority can be any of:
+     * {@link #PRIORITY_AUTO_CONNECT}, {@link #PRIORITY_OFF},
+     * {@link #PRIORITY_ON}, {@link #PRIORITY_UNDEFINED}
+     *
+     * @param device Bluetooth device
+     * @return priority of the device
+     * @hide
+     */
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public int getPriority(BluetoothDevice device) {
+        if (VDBG) log("getPriority(" + device + ")");
+        return BluetoothAdapter.connectionPolicyToPriority(getConnectionPolicy(device));
+    }
+
+    /**
+     * Get the connection policy of the profile.
+     *
+     * <p> The connection policy can be any of:
+     * {@link #CONNECTION_POLICY_ALLOWED}, {@link #CONNECTION_POLICY_FORBIDDEN},
+     * {@link #CONNECTION_POLICY_UNKNOWN}
+     *
+     * @param device Bluetooth device
+     * @return connection policy of the device
+     * @hide
+     */
+    @SystemApi
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(allOf = {
+            android.Manifest.permission.BLUETOOTH_CONNECT,
+            android.Manifest.permission.BLUETOOTH_PRIVILEGED,
+    })
+    public @ConnectionPolicy int getConnectionPolicy(@NonNull BluetoothDevice device) {
+        if (VDBG) log("getConnectionPolicy(" + device + ")");
+        final IBluetoothHeadset service = mService;
+        final int defaultValue = BluetoothProfile.CONNECTION_POLICY_FORBIDDEN;
+        if (service == null) {
+            Log.w(TAG, "Proxy not attached to service");
+            if (DBG) log(Log.getStackTraceString(new Throwable()));
+        } else if (isEnabled() && isValidDevice(device)) {
+            try {
+                final SynchronousResultReceiver<Integer> recv = new SynchronousResultReceiver();
+                service.getConnectionPolicy(device, mAttributionSource, recv);
+                return recv.awaitResultNoInterrupt(getSyncTimeout()).getValue(defaultValue);
+            } catch (RemoteException | TimeoutException e) {
+                Log.e(TAG, e.toString() + "\n" + Log.getStackTraceString(new Throwable()));
+            }
+        }
+        return defaultValue;
+    }
+
+    /**
+     * Checks whether the headset supports some form of noise reduction
+     *
+     * @param device Bluetooth device
+     * @return true if echo cancellation and/or noise reduction is supported, false otherwise
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public boolean isNoiseReductionSupported(@NonNull BluetoothDevice device) {
+        if (DBG) log("isNoiseReductionSupported()");
+        final IBluetoothHeadset service = mService;
+        final boolean defaultValue = false;
+        if (service == null) {
+            Log.w(TAG, "Proxy not attached to service");
+            if (DBG) log(Log.getStackTraceString(new Throwable()));
+        } else if (isEnabled() && isValidDevice(device)) {
+            try {
+                final SynchronousResultReceiver<Boolean> recv = new SynchronousResultReceiver();
+                service.isNoiseReductionSupported(device, mAttributionSource, recv);
+                return recv.awaitResultNoInterrupt(getSyncTimeout()).getValue(defaultValue);
+            } catch (RemoteException | TimeoutException e) {
+                Log.e(TAG, e.toString() + "\n" + Log.getStackTraceString(new Throwable()));
+            }
+        }
+        return defaultValue;
+    }
+
+    /**
+     * Checks whether the headset supports voice recognition
+     *
+     * @param device Bluetooth device
+     * @return true if voice recognition is supported, false otherwise
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public boolean isVoiceRecognitionSupported(@NonNull BluetoothDevice device) {
+        if (DBG) log("isVoiceRecognitionSupported()");
+        final IBluetoothHeadset service = mService;
+        final boolean defaultValue = false;
+        if (service == null) {
+            Log.w(TAG, "Proxy not attached to service");
+            if (DBG) log(Log.getStackTraceString(new Throwable()));
+        } else if (isEnabled() && isValidDevice(device)) {
+            try {
+                final SynchronousResultReceiver<Boolean> recv = new SynchronousResultReceiver();
+                service.isVoiceRecognitionSupported(device, mAttributionSource, recv);
+                return recv.awaitResultNoInterrupt(getSyncTimeout()).getValue(defaultValue);
+            } catch (RemoteException | TimeoutException e) {
+                Log.e(TAG, e.toString() + "\n" + Log.getStackTraceString(new Throwable()));
+            }
+        }
+        return defaultValue;
+    }
+
+    /**
+     * Start Bluetooth voice recognition. This methods sends the voice
+     * recognition AT command to the headset and establishes the
+     * audio connection.
+     *
+     * <p> Users can listen to {@link #ACTION_AUDIO_STATE_CHANGED}.
+     * If this function returns true, this intent will be broadcasted with
+     * {@link #EXTRA_STATE} set to {@link #STATE_AUDIO_CONNECTING}.
+     *
+     * <p> {@link #EXTRA_STATE} will transition from
+     * {@link #STATE_AUDIO_CONNECTING} to {@link #STATE_AUDIO_CONNECTED} when
+     * audio connection is established and to {@link #STATE_AUDIO_DISCONNECTED}
+     * in case of failure to establish the audio connection.
+     *
+     * @param device Bluetooth headset
+     * @return false if there is no headset connected, or the connected headset doesn't support
+     * voice recognition, or voice recognition is already started, or audio channel is occupied,
+     * or on error, true otherwise
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(allOf = {
+            android.Manifest.permission.BLUETOOTH_CONNECT,
+            android.Manifest.permission.MODIFY_PHONE_STATE,
+    })
+    public boolean startVoiceRecognition(BluetoothDevice device) {
+        if (DBG) log("startVoiceRecognition()");
+        final IBluetoothHeadset service = mService;
+        final boolean defaultValue = false;
+        if (service == null) {
+            Log.w(TAG, "Proxy not attached to service");
+            if (DBG) log(Log.getStackTraceString(new Throwable()));
+        } else if (isEnabled() && isValidDevice(device)) {
+            try {
+                final SynchronousResultReceiver<Boolean> recv = new SynchronousResultReceiver();
+                service.startVoiceRecognition(device, mAttributionSource, recv);
+                return recv.awaitResultNoInterrupt(getSyncTimeout()).getValue(defaultValue);
+            } catch (RemoteException | TimeoutException e) {
+                Log.e(TAG, e.toString() + "\n" + Log.getStackTraceString(new Throwable()));
+            }
+        }
+        return defaultValue;
+    }
+
+    /**
+     * Stop Bluetooth Voice Recognition mode, and shut down the
+     * Bluetooth audio path.
+     *
+     * <p> Users can listen to {@link #ACTION_AUDIO_STATE_CHANGED}.
+     * If this function returns true, this intent will be broadcasted with
+     * {@link #EXTRA_STATE} set to {@link #STATE_AUDIO_DISCONNECTED}.
+     *
+     * @param device Bluetooth headset
+     * @return false if there is no headset connected, or voice recognition has not started,
+     * or voice recognition has ended on this headset, or on error, true otherwise
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public boolean stopVoiceRecognition(BluetoothDevice device) {
+        if (DBG) log("stopVoiceRecognition()");
+        final IBluetoothHeadset service = mService;
+        final boolean defaultValue = false;
+        if (service == null) {
+            Log.w(TAG, "Proxy not attached to service");
+            if (DBG) log(Log.getStackTraceString(new Throwable()));
+        } else if (isEnabled() && isValidDevice(device)) {
+            try {
+                final SynchronousResultReceiver<Boolean> recv = new SynchronousResultReceiver();
+                service.stopVoiceRecognition(device, mAttributionSource, recv);
+                return recv.awaitResultNoInterrupt(getSyncTimeout()).getValue(defaultValue);
+            } catch (RemoteException | TimeoutException e) {
+                Log.e(TAG, e.toString() + "\n" + Log.getStackTraceString(new Throwable()));
+            }
+        }
+        return defaultValue;
+    }
+
+    /**
+     * Check if Bluetooth SCO audio is connected.
+     *
+     * @param device Bluetooth headset
+     * @return true if SCO is connected, false otherwise or on error
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public boolean isAudioConnected(BluetoothDevice device) {
+        if (VDBG) log("isAudioConnected()");
+        final IBluetoothHeadset service = mService;
+        final boolean defaultValue = false;
+        if (service == null) {
+            Log.w(TAG, "Proxy not attached to service");
+            if (DBG) log(Log.getStackTraceString(new Throwable()));
+        } else if (isEnabled() && isValidDevice(device)) {
+            try {
+                final SynchronousResultReceiver<Boolean> recv = new SynchronousResultReceiver();
+                service.isAudioConnected(device, mAttributionSource, recv);
+                return recv.awaitResultNoInterrupt(getSyncTimeout()).getValue(defaultValue);
+            } catch (RemoteException | TimeoutException e) {
+                Log.e(TAG, e.toString() + "\n" + Log.getStackTraceString(new Throwable()));
+            }
+        }
+        return defaultValue;
+    }
+
+    /**
+     * Indicates if current platform supports voice dialing over bluetooth SCO.
+     *
+     * @return true if voice dialing over bluetooth is supported, false otherwise.
+     * @hide
+     */
+    public static boolean isBluetoothVoiceDialingEnabled(Context context) {
+        return context.getResources().getBoolean(
+                com.android.internal.R.bool.config_bluetooth_sco_off_call);
+    }
+
+    /**
+     * Get the current audio state of the Headset.
+     * Note: This is an internal function and shouldn't be exposed
+     *
+     * @hide
+     */
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public int getAudioState(BluetoothDevice device) {
+        if (VDBG) log("getAudioState");
+        final IBluetoothHeadset service = mService;
+        final int defaultValue = BluetoothHeadset.STATE_AUDIO_DISCONNECTED;
+        if (service == null) {
+            Log.w(TAG, "Proxy not attached to service");
+            if (DBG) log(Log.getStackTraceString(new Throwable()));
+        } else if (!isDisabled()) {
+            try {
+                final SynchronousResultReceiver<Integer> recv = new SynchronousResultReceiver();
+                service.getAudioState(device, mAttributionSource, recv);
+                return recv.awaitResultNoInterrupt(getSyncTimeout()).getValue(defaultValue);
+            } catch (RemoteException | TimeoutException e) {
+                Log.e(TAG, e.toString() + "\n" + Log.getStackTraceString(new Throwable()));
+            }
+        }
+        return defaultValue;
+    }
+
+    /**
+     * Sets whether audio routing is allowed. When set to {@code false}, the AG will not route any
+     * audio to the HF unless explicitly told to.
+     * This method should be used in cases where the SCO channel is shared between multiple profiles
+     * and must be delegated by a source knowledgeable
+     * Note: This is an internal function and shouldn't be exposed
+     *
+     * @param allowed {@code true} if the profile can reroute audio, {@code false} otherwise.
+     * @hide
+     */
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public void setAudioRouteAllowed(boolean allowed) {
+        if (VDBG) log("setAudioRouteAllowed");
+        final IBluetoothHeadset service = mService;
+        if (service == null) {
+            Log.w(TAG, "Proxy not attached to service");
+            if (DBG) log(Log.getStackTraceString(new Throwable()));
+        } else if (isEnabled()) {
+            try {
+                final SynchronousResultReceiver recv = new SynchronousResultReceiver();
+                service.setAudioRouteAllowed(allowed, mAttributionSource, recv);
+                recv.awaitResultNoInterrupt(getSyncTimeout()).getValue(null);
+            } catch (RemoteException | TimeoutException e) {
+                Log.e(TAG, e.toString() + "\n" + Log.getStackTraceString(new Throwable()));
+            }
+        }
+    }
+
+    /**
+     * Returns whether audio routing is allowed. see {@link #setAudioRouteAllowed(boolean)}.
+     * Note: This is an internal function and shouldn't be exposed
+     *
+     * @hide
+     */
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public boolean getAudioRouteAllowed() {
+        if (VDBG) log("getAudioRouteAllowed");
+        final IBluetoothHeadset service = mService;
+        final boolean defaultValue = false;
+        if (service == null) {
+            Log.w(TAG, "Proxy not attached to service");
+            if (DBG) log(Log.getStackTraceString(new Throwable()));
+        } else if (isEnabled()) {
+            try {
+                final SynchronousResultReceiver<Boolean> recv = new SynchronousResultReceiver();
+                service.getAudioRouteAllowed(mAttributionSource, recv);
+                return recv.awaitResultNoInterrupt(getSyncTimeout()).getValue(defaultValue);
+            } catch (RemoteException | TimeoutException e) {
+                Log.e(TAG, e.toString() + "\n" + Log.getStackTraceString(new Throwable()));
+            }
+        }
+        return defaultValue;
+    }
+
+    /**
+     * Force SCO audio to be opened regardless any other restrictions
+     *
+     * @param forced Whether or not SCO audio connection should be forced: True to force SCO audio
+     * False to use SCO audio in normal manner
+     * @hide
+     */
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public void setForceScoAudio(boolean forced) {
+        if (VDBG) log("setForceScoAudio " + String.valueOf(forced));
+        final IBluetoothHeadset service = mService;
+        if (service == null) {
+            Log.w(TAG, "Proxy not attached to service");
+            if (DBG) log(Log.getStackTraceString(new Throwable()));
+        } else if (isEnabled()) {
+            try {
+                final SynchronousResultReceiver recv = new SynchronousResultReceiver();
+                service.setForceScoAudio(forced, mAttributionSource, recv);
+                recv.awaitResultNoInterrupt(getSyncTimeout()).getValue(null);
+            } catch (RemoteException | TimeoutException e) {
+                Log.e(TAG, e.toString() + "\n" + Log.getStackTraceString(new Throwable()));
+            }
+        }
+    }
+
+    /**
+     * Check if at least one headset's SCO audio is connected or connecting
+     *
+     * @return true if at least one device's SCO audio is connected or connecting, false otherwise
+     * or on error
+     * @hide
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public boolean isAudioOn() {
+        if (VDBG) log("isAudioOn()");
+        final IBluetoothHeadset service = mService;
+        final boolean defaultValue = false;
+        if (service == null) {
+            Log.w(TAG, "Proxy not attached to service");
+            if (DBG) log(Log.getStackTraceString(new Throwable()));
+        } else if (isEnabled()) {
+            try {
+                final SynchronousResultReceiver<Boolean> recv = new SynchronousResultReceiver();
+                service.isAudioOn(mAttributionSource, recv);
+                return recv.awaitResultNoInterrupt(getSyncTimeout()).getValue(defaultValue);
+            } catch (RemoteException | TimeoutException e) {
+                Log.e(TAG, e.toString() + "\n" + Log.getStackTraceString(new Throwable()));
+            }
+        }
+        return defaultValue;
+    }
+
+    /**
+     * Initiates a connection of headset audio to the current active device
+     *
+     * <p> Users can listen to {@link #ACTION_AUDIO_STATE_CHANGED}.
+     * If this function returns true, this intent will be broadcasted with
+     * {@link #EXTRA_STATE} set to {@link #STATE_AUDIO_CONNECTING}.
+     *
+     * <p> {@link #EXTRA_STATE} will transition from
+     * {@link #STATE_AUDIO_CONNECTING} to {@link #STATE_AUDIO_CONNECTED} when
+     * audio connection is established and to {@link #STATE_AUDIO_DISCONNECTED}
+     * in case of failure to establish the audio connection.
+     *
+     * Note that this intent will not be sent if {@link BluetoothHeadset#isAudioOn()} is true
+     * before calling this method
+     *
+     * @return false if there was some error such as there is no active headset
+     * @hide
+     */
+    @UnsupportedAppUsage
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public boolean connectAudio() {
+        if (VDBG) log("connectAudio()");
+        final IBluetoothHeadset service = mService;
+        final boolean defaultValue = false;
+        if (service == null) {
+            Log.w(TAG, "Proxy not attached to service");
+            if (DBG) log(Log.getStackTraceString(new Throwable()));
+        } else if (isEnabled()) {
+            try {
+                final SynchronousResultReceiver<Boolean> recv = new SynchronousResultReceiver();
+                service.connectAudio(mAttributionSource, recv);
+                return recv.awaitResultNoInterrupt(getSyncTimeout()).getValue(defaultValue);
+            } catch (RemoteException | TimeoutException e) {
+                Log.e(TAG, e.toString() + "\n" + Log.getStackTraceString(new Throwable()));
+            }
+        }
+        return defaultValue;
+    }
+
+    /**
+     * Initiates a disconnection of HFP SCO audio.
+     * Tear down voice recognition or virtual voice call if any.
+     *
+     * <p> Users can listen to {@link #ACTION_AUDIO_STATE_CHANGED}.
+     * If this function returns true, this intent will be broadcasted with
+     * {@link #EXTRA_STATE} set to {@link #STATE_AUDIO_DISCONNECTED}.
+     *
+     * @return false if audio is not connected, or on error, true otherwise
+     * @hide
+     */
+    @UnsupportedAppUsage
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public boolean disconnectAudio() {
+        if (VDBG) log("disconnectAudio()");
+        final IBluetoothHeadset service = mService;
+        final boolean defaultValue = false;
+        if (service == null) {
+            Log.w(TAG, "Proxy not attached to service");
+            if (DBG) log(Log.getStackTraceString(new Throwable()));
+        } else if (isEnabled()) {
+            try {
+                final SynchronousResultReceiver<Boolean> recv = new SynchronousResultReceiver();
+                service.disconnectAudio(mAttributionSource, recv);
+                return recv.awaitResultNoInterrupt(getSyncTimeout()).getValue(defaultValue);
+            } catch (RemoteException | TimeoutException e) {
+                Log.e(TAG, e.toString() + "\n" + Log.getStackTraceString(new Throwable()));
+            }
+        }
+        return defaultValue;
+    }
+
+    /**
+     * Initiates a SCO channel connection as a virtual voice call to the current active device
+     * Active handsfree device will be notified of incoming call and connected call.
+     *
+     * <p> Users can listen to {@link #ACTION_AUDIO_STATE_CHANGED}.
+     * If this function returns true, this intent will be broadcasted with
+     * {@link #EXTRA_STATE} set to {@link #STATE_AUDIO_CONNECTING}.
+     *
+     * <p> {@link #EXTRA_STATE} will transition from
+     * {@link #STATE_AUDIO_CONNECTING} to {@link #STATE_AUDIO_CONNECTED} when
+     * audio connection is established and to {@link #STATE_AUDIO_DISCONNECTED}
+     * in case of failure to establish the audio connection.
+     *
+     * @return true if successful, false if one of the following case applies
+     *  - SCO audio is not idle (connecting or connected)
+     *  - virtual call has already started
+     *  - there is no active device
+     *  - a Telecom managed call is going on
+     *  - binder is dead or Bluetooth is disabled or other error
+     * @hide
+     */
+    @SystemApi
+    @RequiresLegacyBluetoothAdminPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(allOf = {
+            android.Manifest.permission.BLUETOOTH_CONNECT,
+            android.Manifest.permission.MODIFY_PHONE_STATE,
+    })
+    public boolean startScoUsingVirtualVoiceCall() {
+        if (DBG) log("startScoUsingVirtualVoiceCall()");
+        final IBluetoothHeadset service = mService;
+        final boolean defaultValue = false;
+        if (service == null) {
+            Log.w(TAG, "Proxy not attached to service");
+            if (DBG) log(Log.getStackTraceString(new Throwable()));
+        } else if (isEnabled()) {
+            try {
+                final SynchronousResultReceiver<Boolean> recv = new SynchronousResultReceiver();
+                service.startScoUsingVirtualVoiceCall(mAttributionSource, recv);
+                return recv.awaitResultNoInterrupt(getSyncTimeout()).getValue(defaultValue);
+            } catch (RemoteException | TimeoutException e) {
+                Log.e(TAG, e.toString() + "\n" + Log.getStackTraceString(new Throwable()));
+            }
+        }
+        return defaultValue;
+    }
+
+    /**
+     * Terminates an ongoing SCO connection and the associated virtual call.
+     *
+     * <p> Users can listen to {@link #ACTION_AUDIO_STATE_CHANGED}.
+     * If this function returns true, this intent will be broadcasted with
+     * {@link #EXTRA_STATE} set to {@link #STATE_AUDIO_DISCONNECTED}.
+     *
+     * @return true if successful, false if one of the following case applies
+     *  - virtual voice call is not started or has ended
+     *  - binder is dead or Bluetooth is disabled or other error
+     * @hide
+     */
+    @SystemApi
+    @RequiresLegacyBluetoothAdminPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(allOf = {
+            android.Manifest.permission.BLUETOOTH_CONNECT,
+            android.Manifest.permission.MODIFY_PHONE_STATE,
+    })
+    public boolean stopScoUsingVirtualVoiceCall() {
+        if (DBG) log("stopScoUsingVirtualVoiceCall()");
+        final IBluetoothHeadset service = mService;
+        final boolean defaultValue = false;
+        if (service == null) {
+            Log.w(TAG, "Proxy not attached to service");
+            if (DBG) log(Log.getStackTraceString(new Throwable()));
+        } else if (isEnabled()) {
+            try {
+                final SynchronousResultReceiver<Boolean> recv = new SynchronousResultReceiver();
+                service.stopScoUsingVirtualVoiceCall(mAttributionSource, recv);
+                return recv.awaitResultNoInterrupt(getSyncTimeout()).getValue(defaultValue);
+            } catch (RemoteException | TimeoutException e) {
+                Log.e(TAG, e.toString() + "\n" + Log.getStackTraceString(new Throwable()));
+            }
+        }
+        return defaultValue;
+    }
+
+    /**
+     * Notify Headset of phone state change.
+     * This is a backdoor for phone app to call BluetoothHeadset since
+     * there is currently not a good way to get precise call state change outside
+     * of phone app.
+     *
+     * @hide
+     */
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(allOf = {
+            android.Manifest.permission.BLUETOOTH_CONNECT,
+            android.Manifest.permission.MODIFY_PHONE_STATE,
+    })
+    public void phoneStateChanged(int numActive, int numHeld, int callState, String number,
+            int type, String name) {
+        final IBluetoothHeadset service = mService;
+        if (service == null) {
+            Log.w(TAG, "Proxy not attached to service");
+            if (DBG) log(Log.getStackTraceString(new Throwable()));
+        } else if (isEnabled()) {
+            try {
+                service.phoneStateChanged(numActive, numHeld, callState, number, type, name,
+                        mAttributionSource);
+            } catch (RemoteException  e) {
+                Log.e(TAG, e.toString() + "\n" + Log.getStackTraceString(new Throwable()));
+            }
+        }
+    }
+
+    /**
+     * Send Headset of CLCC response
+     *
+     * @hide
+     */
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(allOf = {
+            android.Manifest.permission.BLUETOOTH_CONNECT,
+            android.Manifest.permission.MODIFY_PHONE_STATE,
+    })
+    public void clccResponse(int index, int direction, int status, int mode, boolean mpty,
+            String number, int type) {
+        final IBluetoothHeadset service = mService;
+        if (service == null) {
+            Log.w(TAG, "Proxy not attached to service");
+            if (DBG) log(Log.getStackTraceString(new Throwable()));
+        } else if (isEnabled()) {
+            try {
+                final SynchronousResultReceiver recv = new SynchronousResultReceiver();
+                service.clccResponse(index, direction, status, mode, mpty, number, type,
+                        mAttributionSource, recv);
+                recv.awaitResultNoInterrupt(getSyncTimeout()).getValue(null);
+            } catch (RemoteException | TimeoutException e) {
+                Log.e(TAG, e.toString() + "\n" + Log.getStackTraceString(new Throwable()));
+            }
+        }
+    }
+
+    /**
+     * Sends a vendor-specific unsolicited result code to the headset.
+     *
+     * <p>The actual string to be sent is <code>command + ": " + arg</code>. For example, if {@code
+     * command} is {@link #VENDOR_RESULT_CODE_COMMAND_ANDROID} and {@code arg} is {@code "0"}, the
+     * string <code>"+ANDROID: 0"</code> will be sent.
+     *
+     * <p>Currently only {@link #VENDOR_RESULT_CODE_COMMAND_ANDROID} is allowed as {@code command}.
+     *
+     * @param device Bluetooth headset.
+     * @param command A vendor-specific command.
+     * @param arg The argument that will be attached to the command.
+     * @return {@code false} if there is no headset connected, or if the command is not an allowed
+     * vendor-specific unsolicited result code, or on error. {@code true} otherwise.
+     * @throws IllegalArgumentException if {@code command} is {@code null}.
+     */
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public boolean sendVendorSpecificResultCode(BluetoothDevice device, String command,
+            String arg) {
+        if (DBG) {
+            log("sendVendorSpecificResultCode()");
+        }
+        if (command == null) {
+            throw new IllegalArgumentException("command is null");
+        }
+        final IBluetoothHeadset service = mService;
+        final boolean defaultValue = false;
+        if (service == null) {
+            Log.w(TAG, "Proxy not attached to service");
+            if (DBG) log(Log.getStackTraceString(new Throwable()));
+        } else if (isEnabled() && isValidDevice(device)) {
+            try {
+                final SynchronousResultReceiver<Boolean> recv = new SynchronousResultReceiver();
+                service.sendVendorSpecificResultCode(device, command, arg,
+                        mAttributionSource, recv);
+                return recv.awaitResultNoInterrupt(getSyncTimeout()).getValue(defaultValue);
+            } catch (RemoteException | TimeoutException e) {
+                Log.e(TAG, e.toString() + "\n" + Log.getStackTraceString(new Throwable()));
+            }
+        }
+        return defaultValue;
+    }
+
+    /**
+     * Select a connected device as active.
+     *
+     * The active device selection is per profile. An active device's
+     * purpose is profile-specific. For example, in HFP and HSP profiles,
+     * it is the device used for phone call audio. If a remote device is not
+     * connected, it cannot be selected as active.
+     *
+     * <p> This API returns false in scenarios like the profile on the
+     * device is not connected or Bluetooth is not turned on.
+     * When this API returns true, it is guaranteed that the
+     * {@link #ACTION_ACTIVE_DEVICE_CHANGED} intent will be broadcasted
+     * with the active device.
+     *
+     * @param device Remote Bluetooth Device, could be null if phone call audio should not be
+     * streamed to a headset
+     * @return false on immediate error, true otherwise
+     * @hide
+     */
+    @RequiresLegacyBluetoothAdminPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(allOf = {
+            android.Manifest.permission.BLUETOOTH_CONNECT,
+            android.Manifest.permission.MODIFY_PHONE_STATE,
+    })
+    @UnsupportedAppUsage(trackingBug = 171933273)
+    public boolean setActiveDevice(@Nullable BluetoothDevice device) {
+        if (DBG) {
+            Log.d(TAG, "setActiveDevice: " + device);
+        }
+        final IBluetoothHeadset service = mService;
+        final boolean defaultValue = false;
+        if (service == null) {
+            Log.w(TAG, "Proxy not attached to service");
+            if (DBG) log(Log.getStackTraceString(new Throwable()));
+        } else if (isEnabled() && (device == null || isValidDevice(device))) {
+            try {
+                final SynchronousResultReceiver<Boolean> recv = new SynchronousResultReceiver();
+                service.setActiveDevice(device, mAttributionSource, recv);
+                return recv.awaitResultNoInterrupt(getSyncTimeout()).getValue(defaultValue);
+            } catch (RemoteException | TimeoutException e) {
+                Log.e(TAG, e.toString() + "\n" + Log.getStackTraceString(new Throwable()));
+            }
+        }
+        return defaultValue;
+    }
+
+    /**
+     * Get the connected device that is active.
+     *
+     * @return the connected device that is active or null if no device
+     * is active.
+     * @hide
+     */
+    @UnsupportedAppUsage(trackingBug = 171933273)
+    @Nullable
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_CONNECT)
+    public BluetoothDevice getActiveDevice() {
+        if (VDBG) Log.d(TAG, "getActiveDevice");
+        final IBluetoothHeadset service = mService;
+        final BluetoothDevice defaultValue = null;
+        if (service == null) {
+            Log.w(TAG, "Proxy not attached to service");
+            if (DBG) log(Log.getStackTraceString(new Throwable()));
+        } else if (isEnabled()) {
+            try {
+                final SynchronousResultReceiver<BluetoothDevice> recv =
+                        new SynchronousResultReceiver();
+                service.getActiveDevice(mAttributionSource, recv);
+                return Attributable.setAttributionSource(
+                        recv.awaitResultNoInterrupt(getSyncTimeout()).getValue(defaultValue),
+                        mAttributionSource);
+            } catch (RemoteException | TimeoutException e) {
+                Log.e(TAG, e.toString() + "\n" + Log.getStackTraceString(new Throwable()));
+            }
+        }
+        return defaultValue;
+    }
+
+    /**
+     * Check if in-band ringing is currently enabled. In-band ringing could be disabled during an
+     * active connection.
+     *
+     * @return true if in-band ringing is enabled, false if in-band ringing is disabled
+     * @hide
+     */
+    @SystemApi
+    @RequiresLegacyBluetoothPermission
+    @RequiresBluetoothConnectPermission
+    @RequiresPermission(android.Manifest.permission.BLUETOOTH_PRIVILEGED)
+    public boolean isInbandRingingEnabled() {
+        if (DBG) log("isInbandRingingEnabled()");
+        final IBluetoothHeadset service = mService;
+        final boolean defaultValue = false;
+        if (service == null) {
+            Log.w(TAG, "Proxy not attached to service");
+            if (DBG) log(Log.getStackTraceString(new Throwable()));
+        } else if (isEnabled()) {
+            try {
+                final SynchronousResultReceiver<Boolean> recv = new SynchronousResultReceiver();
+                service.isInbandRingingEnabled(mAttributionSource, recv);
+                return recv.awaitResultNoInterrupt(getSyncTimeout()).getValue(defaultValue);
+            } catch (RemoteException | TimeoutException e) {
+                Log.e(TAG, e.toString() + "\n" + Log.getStackTraceString(new Throwable()));
+            }
+        }
+        return defaultValue;
+    }
+
+    /**
+     * Check if in-band ringing is supported for this platform.
+     *
+     * @return true if in-band ringing is supported, false if in-band ringing is not supported
+     * @hide
+     */
+    public static boolean isInbandRingingSupported(Context context) {
+        return context.getResources().getBoolean(
+                com.android.internal.R.bool.config_bluetooth_hfp_inband_ringing_support);
+    }
+
+    @SuppressLint("AndroidFrameworkBluetoothPermission")
+    private final IBluetoothProfileServiceConnection mConnection =
+            new IBluetoothProfileServiceConnection.Stub() {
+        @Override
+        public void onServiceConnected(ComponentName className, IBinder service) {
+            if (DBG) Log.d(TAG, "Proxy object connected");
+            mService = IBluetoothHeadset.Stub.asInterface(service);
+            mHandler.sendMessage(mHandler.obtainMessage(
+                    MESSAGE_HEADSET_SERVICE_CONNECTED));
+        }
+
+        @Override
+        public void onServiceDisconnected(ComponentName className) {
+            if (DBG) Log.d(TAG, "Proxy object disconnected");
+            doUnbind();
+            mHandler.sendMessage(mHandler.obtainMessage(
+                    MESSAGE_HEADSET_SERVICE_DISCONNECTED));
+        }
+    };
+
+    @UnsupportedAppUsage
+    private boolean isEnabled() {
+        return mAdapter.getState() == BluetoothAdapter.STATE_ON;
+    }
+
+    private boolean isDisabled() {
+        return mAdapter.getState() == BluetoothAdapter.STATE_OFF;
+    }
+
+    private static boolean isValidDevice(BluetoothDevice device) {
+        return device != null && BluetoothAdapter.checkBluetoothAddress(device.getAddress());
+    }
+
+    private static void log(String msg) {
+        Log.d(TAG, msg);
+    }
+
+    @SuppressLint("AndroidFrameworkBluetoothPermission")
+    private final Handler mHandler = new Handler(Looper.getMainLooper()) {
+        @Override
+        public void handleMessage(Message msg) {
+            switch (msg.what) {
+                case MESSAGE_HEADSET_SERVICE_CONNECTED: {
+                    if (mServiceListener != null) {
+                        mServiceListener.onServiceConnected(BluetoothProfile.HEADSET,
+                                BluetoothHeadset.this);
+                    }
+                    break;
+                }
+                case MESSAGE_HEADSET_SERVICE_DISCONNECTED: {
+                    if (mServiceListener != null) {
+                        mServiceListener.onServiceDisconnected(BluetoothProfile.HEADSET);
+                    }
+                    break;
+                }
+            }
+        }
+    };
+}